Throttle-valve.



1510.847326] PA ENTED MAR. 19, 1907.

w. PERRISIGT J. M. ALLEN.

THROTTLE VALVE.

APPLICATION FILED APR.4,1906

3 SHEETS-SHEET 1.

3 S EPS-SHEET 2.

Nb. 847,326. PATENTED MAR. 19, 1907.

W. FERRIS & J. M. ALLEN.

THROTTLE VALVE.

APPLIOA'I'ION FILED ABBA, 1906.

h l g THE NORRIS PETlRS CO, WASHINGTON, D. C.

PATENTED MAR. 19, 1907.

W PERRIS & J M ALLEN THROTTLE VALVE. APPLICATION FILED APR 4,1906

3 SHEETS-SHEET a.

fiwerdrm 2% 0% Wificamem- THE NORRIS PE'rtPs cu., wAsmNuwN,'n. c.

UNITED STATES OFFICE.

\WALTER FERRIS AND-JEAN :MAROHALLEN, OF SOUTH MILWAUKEE, WIS- CONSIN, ASSIGNORS TO THE .BUOYRUS COMPANY, OF SOUTH MILWAU- KEE, WISCONSIN, A'CORPORATION-OF WISCONSIN.

THROTTLE-VALVE.

'Specification of Letters Patent.

Patented March 1- 9, 1907.

Application-filed April 4;; 1906. Serial No. 309,820.

and we do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled. in the art to which itlappertains to makeand use the same.

The invention rel ates to throttle-valves for steam, hydraulic, or other fluid pressure engines, and has for its object to produce a substantially balanced steam-tight non-leaking valve which may be successfully operated to permit steam or other pressureztobe; gradually admittedto the engine in desired quantity; topermit the pressurcto be cut ofl at thesupply and passedback from the engine or motor by way of the outlet throughithe valve to the exhaust; to permit the engine or motor to be reversed rapidly or slowly, as desired, and to permit thepressure to be cut oil absolutely between the inlet, outlet and exhaust openings. A valve having these characteristics finds a ,particularly advantageous application in controlling the operation of .holstmg engines or motorswhen 1t.1s found necessary to raise or lower the load gradually or rapidly or to hold the-loadinany desired positionand belongsgenerally to the class of control or throttle valves, such-as thoseillustrated in the patents to George W. King, No. 7 01,574, issued June 3, 1902, Kieckheferi and Cadman, No. 477,055,-issued June 14, 1892,

and'Joseph K. Smith, No. 653,187, issued July 3, 1900.

:In the accompanying drawings, Figure 1 is a vertical section showing'the valve closed. Fig. 2 is a similar view showing the valve open to the discharge. Fig. 3 is a similar view showing the valve closed to thesupply and open between thedischarge and [the exhaust. Figs. 4 and 5 are end views of the valve.

Referring to the drawings, (0 indicates the valve-casing, which is provided withaninletopening I), an outlet-opening b, and an exhaust-opening h, connected with the interior of the casing by means of a passage g. The

inlet-opening b communicates with piping leading toasource of steam, hydraulic,-or other fluid pressure, and the outlet opening b communicates with the engine, .motor,=or other mechanism adapted'to be operated-by .the fluid-pressure.

Mounted longitudinally in the valve casing 'a andpreferably betweenthe inlet-opening on one side and the outlet and exhaust openings on the'other side is a valve-chamberic, which may be conveniently formed as an open-ended cylinder which communicates with the inlet 1) by means of sidepassagesid d adjacent to the open ends of said cylinder. The interior walls of the valve-chamber care provided with grooves e and f, which may be conveniently extended entirely around the periphery of said chamber to constituteannularports communicating with the outlet 6 .andthepassage g leading to the exhausth. The annular ports eandf are preferably inclined axially to the valve-chamber, .and therefore to the cooperating valve, for=a purose to be hereinafter more fully explained.

Slidably mounted in the valve-chamberc is a piston-valve j, whichfits steam tight within the walls of the chamber. andis adapted to be reciprocated-therein by'means-of a stem Z, provided with an operating-lever a, mounted upon a suitable shaft u and'having an operatingehandle 10. The stem .may be packed in any suitable manner, as bymeans of a stuffing-box m, to avoid leakage of steam orfluid pressure past the stem. The valvej is provided with a reduced portion hintermediate its ends, which is adapted to be brought into registry with the annular-ports e and f in order to establish communication between the engine ormotorand the exhaust 72,. The outer peripheral edge of the piston T valve adjacent the stufling-box is beveled'or .chamfered, as at 7', so that when the valve is moved inward to establish communication between the inlet 1) and the outlet 1) through the corresponding end of the valve-chamber c the chamfered edge j will cooperate with the axially-inclined port a to throttle lthe fluid-pressure toany desired degree, according to the extent of movement of the valve. The casing a is preferably provided with end caps and y, by means of whichready access may be had to the interior of the casing and the valve. p

In the position of the valve illustrated in Fig. 1 it will be noted that communication -3detween the inlet b and the outlet 1/ and between the outlet Z2 and the exhaust h is cut off absolutely and no fluid-pressure is admitted to the engine or motor, and correspondingly any pressure stored in the motor is prevented from exhausting back through the outlet Z) to the exhaust-opening it. When it is desired to start the engine or motor, the valve j is moved inward until the edge j thereof begins to uncover the annular port 6. Owing to the chamfer or bevel on the edge and the axial inclination of the annular port 0, it will be noted that an efficient throttling of the pressure may be effected, first, because the beveled edge will gradually open communication with port 6, and, second, because the axial disposition of said port with respect to the movement of the'valve will ally as the valve is advanced. By these means any desired degree of throttling action may be attained. When the valve has been advanced to the extreme limit of its forward throw, the annular port 6 is entirely opened and free communication is established between the inlet band the outlet 6. It will thus be seen that by shifting the valve backward and forward through its various open positions the pressure may be throttled by any'desired amount and the motor or engine may be operated at any desired speed. Should it be found desirable to lower the load, the engine or motor may be permitted to reverse by moving the valve to a position to uncover the passage g, communicating with the exhaust, to establish communication between the exhaust and the outlet 7) by way of annular ports 6 and f and the reduced portion 76 of the valve, as shown in Fig. 3. As the port f is also axially inclined, it will be apparent-that any desired degree of throttling of the pressure between the motor and the exhaust may be accomplished by adjusting the position of the valve to cause the reduced portion is thereof to register to a greater or less extent with said inclined port f. It will thus be seen that by adjusting the valve through its various positions the pressure may be cut off entirely from the engine or motor, as in Fig. 1, may be admitted. to the engine or motor with any degree of throttling, as in Fig. 2, or may be cut off between the supply and the motor and the fluid remaining in the motor and its connecting pipes permitted to escape at any desired rate of speed past the reduced portion k of the valve to the exhaust, as in Fig. 3, and thereby permit the engine or motor to turn backward at any desired speed.

What we claim is 1. A throttle-valve, comprising a valvecasing provided with inlet, outlet and exhaust openings, an interior cylindrical valvecause the latter to uncover the port graduseat provided with an annular port in the inner walls thereof, communicating with the exhaust-opening of the casing, and a pistonvalve having a reduced portion intermediate the ends thereof cooperating with said valveseat, whereby communication may be established between the outlet and the exhaust openings of the casing, said annular port being inclined with respect to the axis of the valve to eifect a gradual opening or closing of said port.

2. A throttle-valve, comprising a valvecasing provided with inlet, outlet and ex haust openings, an interior cylindrical valve seat provided with annular ports in the inner walls thereof communicating with the exhaust and outlet openings, respectively, of the casing, and a piston-valve cooperating with said valve-seat, said valve having a reduced intermediate portion to establish communication between the outlet and exhaust openings of the casing by way of one of said annular ports, said annular ports being 1nclined to the axis of the valve to effect a gradual opening or closing of said ports.

3. A throttle-valve, comprising a valvecasing provided with inlet, outlet and exhaust openings, a cylindrical valve-seat in said casing open at both ends and having in the inner walls thereof axially-inclined ports communicating with the outlet and exhaust openings, respectively, and a valve slidably mounted in said seat adapted to establish a throttling connection past the end thereof between the inlet and outlet openings, and

having a reduced intermediate portion adapted to establish a throttling connection between the outlet-opening and the exhaust opening.

4. A throttle-valve, comprising a valvecasing provided with inlet, outlet and exhaust openings, a cylindrical valve-seat in said casing open at both ends and having in the inner walls thereof axially-inclined ports communicating with the outlet and exhaust openings, respectively, and a valve slidably mdunted in said seat adapted to establish a throttling connection past the end thereof between the inlet and outlet openings, the end of said valve being chamfered to cooperate with the axially-inclined port communicating with the outlet-opening, said valve having a reduced intermediate portion adapted to establish a throttling connection between the outlet-opening and the exhaustopening.

In testimony whereof we aflix our signatures in presence of two witnesses.

WALTER FERRIS. JEAN MARCH ALLEN. 

